//D4-----LED
//HIGH---1
//LOW---0
int deng = 2;
void setup() {
  // put your setup code here, to run once:
  pinMode(deng,OUTPUT);
  digitalWrite(deng,LOW);
  //pinMode(2, OUTPUT);
  //delay(500);
  //digitalWrite(2,1);

  
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(deng, HIGH);
  delay(1000);
  digitalWrite(deng, LOW);
  delay(1000);
  
}
